Speed-o'-Sound Sonic (音速のソニック, Onsoku no Sonikku), more commonly called Sonic (ソニック, Sonikku), is a recurring villain and occasional anti-hero. He first appeared as a bodyguard hired by Zeniru. He is a former member of the 44th Graduation Class of the Ninja Village, nicknamed The End (終わり, Owari; Viz: The Final). Sonic is also a self-declared eternal rival of Saitama.


"Whenever I face you, I cannot picture myself winning for some reason. Unless I defeat you and wipe out this thought, I cannot move on."